[amsat-bb] Chinese Lunar sats

Wed May 23 10:18:48 UTC 2018

Dear All,

Thanks for all the good advices and infos. I will have to learn
Ubuntu/Linux for the decoder, will try this week-end and hopefully get the
decoder working. However the sats may be too far for my setup as having
only one 16 ele. cross yagi only on 70cm + good quality preamp,

I believe that FT4 transmission should work (at least Rx), hopefully.

Until the birds reach the moon pointing the antenna is very important, I am
using the Celestrack Keplers elements with SatPC32. Any expert with outer
space antenna pointing to confirm that this is OK?

I also not sure if SatPC32 will handle the Doppler properly and if
any special setting required. Anyone have any ideas about this?

73

Jean Marc (3B8DU)

On 23 May 2018 at 04:19, Dave Webb KB1PVH <kb1pvh at gmail.com> wrote:

> From earlier post.
>
> 韦明川 via <https://support.google.com/mail/answer/1311182?hl=en> amsat.org
> May 19 (3 days ago)
> to amsat-bb
> Hi OMs,
>
>
> If the One Drive link for DSLWP does not work, please have a try with this:
> https://drive.google.com/file/d/16YQ3XvQ9hLp6ckpwFj4OkxO2ONzJ8
> ZSw/view?usp=sharing
>
>
> 73!
>
>
> Wei BG2BHC
>
>
> On Tue, May 22, 2018 at 8:06 PM, Walter Holmes <walterh at k5wh.net> wrote:
>
> > So where is this LIVE cd that is mentioned for these new sats?
> >
> > Thanks,
> >
> > Walter/K5WH
> >
> > -----Original Message-----
> > From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Larry Howell
> > Sent: Tuesday, May 22, 2018 3:27 PM
> > To: Scott <scott23192 at gmail.com>; amsat-bb at amsat.org
> > Subject: Re: [amsat-bb] Chinese Lunar sats
> >
> > Scott and the other Windows users,
> >
> > Windows is completely ignored.  The live Linux CD is live!  You insert it
> > in your DVD/CD drive and reboot your PC.  Linux will load into RAM and
> run
> > exclusively from RAM.  It has a desktop not much different from a Windows
> > PC or an Apple Mac.  Give it a try.  My mother started using Linux when
> she
> > was 84, and she certainly didn't have an IT background!
> >
> > Larry AC8YE
> >
> > On Tue, May 22, 2018 at 1:50 PM, Jean Marc Momple <
> > jean.marc.momple at gmail.com> wrote:
> >
> > >
> > > Scott,
> > >
> > > Thanks and my greetings to you also.
> > >
> > > Very clear and thank you for the insights.
> > >
> > > Unfortunately I don’t have the required skills about linux and IT, in
> > > spite having quite a good RF knowledge (some 40 years professionally
> > > in SATs, Mobile, PMR, microwave and mobile up to 5G now), i just know
> > > how to install the APP’s o a PC and to do some basics settings…
> > >
> > > Also, my station is quite average as yours, as the Longjiang
> > > experiment is quite interesting will continue to watch out and try
> > > receive some signals from these birds. But again wish to stress that
> > > the project managers would have much more audience and feedback if
> > > sharing more info (basic marketing), just a honest comment for
> > improvement in such future projects.
> > > This seems always to be the case in such HAM sat ventures, that the
> > > direct stakeholders are so taken with urgent matters (fully
> > > understood) that they fail to communicate well to get the best
> > > feedback after launch from the HAM community which actually would help
> > > them a lot in assessing there bird performance.
> > >
> > > Hope my comments will help to improve our beloved projects.
> > >
> > > 73
> > >
> > >
> > > Jean Marc (3B8DU)
> > >
> > >
> > > > On May 22, 2018, at 8:42 PM, Scott <scott23192 at gmail.com> wrote:
> > > >
> > > > Greetings!
> > > >
> > > > The software on github  (https://github.com/bg2bhc/gr-dslwp) is for
> > > > use
> > > in GNU Radio on linux, so a Windows computer would not be helpful for
> > that.
> > > >
> > > > In the hours after launch, several Amateurs
> > > > (http://lilacsat.hit.edu.cn/
> > > dashboard/pages_en/contribute.html) successfully decoded the 70cm
> > > telemetry using those GNU Radio flowgraphs (I got some partial decodes
> > > but low SNR here prevented me from getting complete packets - but I
> > > was still very pleased!).
> > > >
> > > > Last night (U.S. time), I'm not aware of anyone receiving any of the
> > > 70cm telemetry.  We were asked to watch for JT4 as well, but I'm not
> > > aware that any was received.
> > > >
> > > > As mentioned earlier in this thread, the team has lost S-Band
> > > > contact
> > > with one of the cubesats.  I'm not setup to receive those frequencies
> > > but others are watching for the signals.
> > > >
> > > > For an average station like myself, the plan will be to continue to
> > > watch for 70cm telemetry with the GNU Radio software & JT4 with a
> > > second SDR.
> > > >
> > > > Hope that helps!
> > > >
> > > > -Scott,  K4KDR
> > > >
> > > >
> > > > ===========================================
> > > >
> > > > -----Original Message----- From: Jean Marc Momple
> > > > Sent: Tuesday, May 22, 2018 12:21 PM
> > > > To: Nico Janssen
> > > > Cc: AMSAT BB
> > > > Subject: Re: [amsat-bb] Chinese Lunar sats
> > > >
> > > > Nico,
> > > >
> > > > I have been trying to capture the signals from the both Longjiang
> > > > sats
> > > for the past 2 days.
> > > >
> > > > On Monday it seems that I receive a carrier on the right frequency
> > > > but
> > > was not able to confirm that it was from Longjiang 1.
> > > >
> > > > I used the initial Keppler’s and now using Celestrac in SatPC32
> > > > which
> > > seems to be OK when comparing with N2YO ele/az. I have been monitoring
> > > on the announced FX and having also JT4G “on” for about this evening
> > > without any results.
> > > >
> > > > For sure I am doing something wrong but cannot figure it out due to
> > > > the
> > > lack of information.
> > > >
> > > > Also, trying to get a decoder software for the GMSK telemetry is
> > > > quite
> > > difficult for a non-IT geek, I don’t have clue how to have the
> > > published GITHUB decoder to work on my Windows computers…
> > > >
> > > > Here we are this side.
> > > >
> > > > Quite frustrating that the communication is not that good, as if the
> > > project team want the maximum of feedback and TLM they should provide
> > > a minimum of info. Just a personal opinion.
> > > >
> > > > Anyway will try hard to receive these birds as a real opportunity
> > > > for
> > > HAM to learn more on outer space com, if anyone can help and share,
> > > particularly the guys who already decoded the birds, it would be more
> > > welcomed.
> > > >
> > > > 73
> > > >
> > > >
> > > >
> > > > Jean Marc (3B8DU)
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >> On May 22, 2018, at 5:03 PM, Nico Janssen <hamsat at xs4all.nl> wrote:
> > > >>
> > > >> After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2 were
> > > >> maneuvered onto a track to the Moon. Several amateurs received
> > > >> telemetry from the satellites. But now LJ 1 appears to encounter
> > > >> problems.
> > > >>
> > > >> Quoting Wei BG2BHC:
> > > >> "Can you help to find amateurs in the US to help to monitor DSLWP-A
> > > >> on 435.425 and 436.425 now?
> > > >> We lost the contact of satellite A on S band after an orbit
> > adjustment.
> > > >> We just tried to switch on UHF, but we don't know if it works or
> not.
> > > >> The sat is just above South America.
> > > >> If it works, 435.425 should be 500bps GMSK and JT4 alternately.
> > > >> 436.425 should be 250 bps GMSK.  Bothtransmit once in 5 minutes.
> > > >>
> > > >> Thank you very much!
> > > >>
> > > >> Wei"
> > > >>
> > > >> 73,
> > > >> Nico PA0DLO
> > > >>
> > > >> On 22-05-18 12:15, Mike Seguin wrote:
> > > >>> Any word on the two Chinese microsats LongJiang 1 & 2?
> > > >
> > > > _______________________________________________
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> > _______________________________________________
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> > all interested persons worldwide without requiring membership. Opinions
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> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions
> > expressed
> > are solely those of the author, and do not reflect the official views of
> > AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>